Preparation method of titanium-containing nano-mordenite molecular sieve

A technology of mordenite and molecular sieve, which is applied in the field of synthesis of titanium (Ti) mordenite molecular sieve, to achieve the effect of shortening crystallization time and reducing titanium content

Inactive Publication Date: 2012-09-19
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the direct use of hydrothermal synthesis to introduce Ti atoms into mordenite has not been reported yet.

Method used

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  • Preparation method of titanium-containing nano-mordenite molecular sieve
  • Preparation method of titanium-containing nano-mordenite molecular sieve
  • Preparation method of titanium-containing nano-mordenite molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 10.48 g NaOH to 190 ml of deionized water, stir until the solution is clear, add 1.6 g of sodium metaaluminate to the above solution, continue stirring at room temperature until the solids are completely dissolved, and then add 200 ml of deionized water to it, Add 27.52 g of fumed silica gel to the above mixed solution, continue to stir strongly for 1 hour, then add 2.76 g of mordenite as a seed crystal into the reaction system, and continue to stir for 0.5 hours after the addition to form system (1);

[0024] 2.980 g triethanolamine (TEAH 3 ) was mixed with 3.400 g butyl titanate to form system (2);

[0025] Add system (2) to system (1) quickly, stir for 0.5h, and finally put the mixture into a polytetrafluoroethylene-lined stainless steel crystallization kettle, seal it and crystallize it in an oven at 170°C for 24 hours, After filtering, washing and drying, a solid product was obtained. The molar composition of the initial sol of the mixture is: SiO 2 :Al 2 ...

Embodiment 2

[0028] Except that Qingdao silica gel was used instead of the fumed silica gel in Example 1 as the silicon source, other preparation conditions were the same as in Example 1.

[0029] The solid product is characterized by X-rays, SEM images, and UV-Vis images to be titanium-containing mordenite.

Embodiment 3

[0031] Except that triethanolamine in Example 1 was replaced with methylamine as the small organic molecule, other preparation conditions were the same as in Example 1.

[0032] The solid product is characterized by X-rays, SEM images, and UV-Vis images to be titanium-containing mordenite.

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Abstract

The invention discloses a synthesis method of a titanium-containing nano-mordenite molecular sieve, comprising the following steps of: firstly, dissolving an aluminum source in sodium hydroxide solution, adding a silicon source, stirring by strong magnetic force at room temperature for evenly dispersing, mixing the evenly-dispersed silicon source and aluminum source solution to prepare glue at room temperature, adding the mordenite molecular sieve serving as a seed crystal, quickly adding Ti-containing micromolecule organic amine solution into the mixed solution, stirring by strong magnetic force at room temperature for evenly dispersing, transferring into a reaction crystallization kettle, carrying out crystallization reaction at 150-170DEG C for 0.5-3d, and carrying out conventional leaching, washing and drying operations to obtain a solid product. The synthesis method has the characteristic that the titanium atom is led into a micropore skeleton in the manner of quadridentate and high dispersion by using hydro-thermal synthesis, the micromolecule organic amine serving as the chelant of impurity metal titanium atom, and the one-step method is used, so that the obtained titanium-containing nano-mordenite molecular sieve is high in crystallinity and purity, controllable in particle size and shape and low in cost, and causes little environment pollution, thereby being convenient for the large-scale industrial production.

Description

technical field [0001] The invention relates to the synthesis of zeolite molecular sieves, in particular to a method for synthesizing titanium (Ti)-containing mordenite molecular sieves. Specifically, using small molecular organic amines as chelating agents for heterometal atoms to directly introduce titanium (Ti) into the framework of microporous materials through hydrothermal synthesis to synthesize titanium (Ti) nano-mordenite molecular sieves. Background technique [0002] Microporous molecular sieves have uniform pore structure, suitable acidity and good hydrothermal stability, and have become important petrochemical catalytic materials. Hydrogen-type mordenite with one-dimensional twelve-membered ring straight cylindrical channels (pore size 0.695 nm × 0.581 nm) exhibits excellent catalytic performance in toluene disproportionation, alkylation, isomerization of C8 aromatics and selective disproportionation of toluene . The current research focus on mordenite molecula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/26B82Y40/00
Inventor 张坤徐浪浪吴光东吴海虹薛青松吴鹏
Owner EAST CHINA NORMAL UNIV
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